The phase voltage in a wye connected device is 277v. What is the line to line voltage?

Question

I took the square root of 3 times the phase voltage and got approximately 28.83. Is this right?

Answer 1

Since the square root of 3 is 1.732, I don't see how you could multiply that times 277 and get 28.83 for a result.

Yes, the square root of 3 is the multiplier so multiplying 1.732 * 277 results in a line-to-line voltage of 480 volts. (Watch out for that stuff, it's nasty.)

Answer 2

277 x √3 = 480

You have the correct formula, but you applied the √3 incorrectly when using the calculator.

You did 277 x 3 = 831, and then √831 = 28.83.

√3 = 1.73